Metallic fastener.



G. W. MOGILL. METALLIC FASTENER- APPLIOATION FILED JUNE 3, 1907.

I 974,805. Patented Nov. 8, 1910.

WITNESSES INVENTOI'? g, p/fgvk STTS METALLIC FASTENER.

Specification of Letters Patent.

Patented Nov. 8, 1910.

Application filed June 3, 1907. Serial No. 376,990.

To all whom it may concern:

Be it known that I, GEORGE WV. MoGILL, a citizen of the United States,and a resident of Riverdale-on-I-Iudson, in the county of New York andState of New York, have invented certain new and useful Improvements inMetallic Fasteners, of which the following is a specification.

My invention relates to that class of metallic fastenings, having apenetrating shank composed of two blades normally seated in contact witheach other lengthwise, and which make but one hole in the papers orother articles in which the shank is inserted, the blades of the shankopening from each other after passing through such papers and confiningthe latter between their folded over surfaces and the cap or head of thefastener.

In the improved fastener constructed as hereinafter described the twoblades providing the fastener shank may be made with parallel edges, butare preferably provided with edges which taper from the transverse foldproviding their heading or capping parts to the terminals of their freeends, and are folded longitudinally in manner to provide one surface ofeach blade with a groove seatedalong the longitudinal center of suchsurface, and the opposite surface of such.

blade with two grooves seated one along each edge of the blade, to theend that when the fastener shank is inserted through papers or othermaterial being fastened and its blades are folded apart and down uponsuch material, the edges of the blades will bear upon the latterthroughout the entire length of their folded over portion and willpresent above such material outwardly smooth rounded surfaces decreasingin width and in height of convexity from the line of such fold to theirfree terminals.

In the accompanying drawing forming part of this specification, and inwhich similar reference characters indicate corresponding parts, Figure1, is a plan View of a blade of the fastener shank, Fig. 2, is a similarview in perspective showing the heading part of the blade folded to aright angle with the blade proper and the latter provided with itslongitudinal grooves. Fig. 3, is a perspective view of both bladesfashioned as shown in Fig. 2, and placed together in position forcapping. Fig. 4, is a plan view of the fastener cap, and Fig. 5,represents a cross section of such cap. Fig. 6, is an edge view of thecompleted. fastener. Fig. 7, is a cross section of the shank taken onthe line 00, as, of Fig. 6. Fig. 8, is a view of Fig. 6, looking fromits shank point. Fig. 9, is an edge View of the fastener applied infastening together several sheets of material. Fig. 10, is a view of theupper surface of Fig. 9, and Figs. 11 and 12, show modifications in theconfiguration of the fastener.

In the fastener form shown in Figs. 1 to 10, inclusive, the shank of thefastener is composed of two metal blanks shaped as shown in Fig. 1,consisting of a heading or capping part A, having a semi-circular form,and a blade B, tapering from its connection with such capping part toits free end. The blade B, is by means of suitable dies folded or drawn011 the transversely curving line a to a right angle with the cappingpart A, such process of drawing or folding providing the bladelongitudinally on one surface with the grooves 2, 2, seated along itsedges and its opposite surface with the groove 1, seated along itslongitudinal center or axis. Two such blades are set together with theirgrooves 1, l, facing each other as in Fig. 3, and a metal cap such asshown in Figs. 4, 5, is placed over their capping parts A, A, and isupset or closed thereon as shown in Figs. 6, 8, completing the fastener,which may now be put to use as intended by inserting its shank in thematerial to be fastened and folding the projecting portion of its bladesapart and down upon such material, as shown in Figs. 9, 10, and whereinthe material fastened is marked 0.

The grooves 1, 2, 2, drawn longitudinally in the opposite surfaces ofthe blades have for their object the stiffening of the blades throughthe transverse curvatures they impart to them; the bringing of the edgesof the respective blades, and the convex surfaces of theirlongitudinally grooved centers into the same plane so that they willsimultaneously bear upon the surface of the material they fasten; and toimpart to the blades a maximum of strength with a minimum ofconcavo-convexity of their surfaces.

In the construction shown in Figs. 11 and 12, the fastener is made froma single strip of sheet metal having tapering end portions which arebent down from a center part A on transversely curving lines providingthe shank-blades B, B, of this construction and which are providedlongitudinally with the grooves l, 2, 2, as in the other figures. Thecentralportion A is then bent over upon itself on the dotted lines 3, 3,Fig. 11, bringing the backs of the shank blades together with theiredges projecting in directions extending away from the longitudinal axisof the shank as shown in Fig. 12, and other figures of the drawing,completing this construction of the fastener, which, if desired, may befurnished with a metal cap upset upon its head part as in the otherfigures. 7

Having thus fully described the construc tion, operation and object ofmy invention, what I claim as new and desire to secure by Letters Patentis 1. A metallic fastener having two blades composing its penetratingshank each blade being folded longitudinally in manner to provide onesurface of each blade with a groove seated along its longitudinal centerand the opposite surface of such blade with two grooves seated one alongeach edge of such blade.

2. A metallic fastener having two blades composing its penetrating shankeach blade being folded longitudinally in manner to provide one surfaceof each blade with a groove seated along its longitudinal center and theopposite surface of such blade with two grooves seated one along eachedge of such blade, with the centrally located grooves of both bladesnormally opening toward each other in the fastener shank and having thetwo edges of one blade facing in one direction and the two edges of theother blade facing in an opposite direction.

3. A metallic fastener having two blades composing its penetrating shankwith each one of such blades provided with a cappingend folded at rightangles from the blade proper, and having the blades proper foldedlongitudinally in manner to provide the inner surface of each blade witha groove seated along its longitudinal center and the outer surface ofsuch blade with two grooves seated one along each edge of such blade,and having the centrally grooved surfaces of both blades normally facingeach other in the fastener shank and having both blades secured togetherin such position by a metal cap closed upon their capping ends.

4. A metallic fastener having blades composing its shank foldedlongitudinally in manner to cause the convex surface of the longitudinalaxis of each blade and both edges of such blade to face in the samedirection.

5. A metallic fastener having blades com-- posing its shank foldedlongitudinally in manner to cause the convex surface of the longitudinalaXis of each blade and both edges of such blade to face in the samedirection and to occupy the same plane.

Signed at New York city in the county of New York and State of New Yorkthis 31st day of May A. D. 1907.

GEORGE \V. MoGILL.

lVitnesses W. HARRY MGGILL, JACOB N. HAIGHT.

